81 乘法 8 等于多少？

81 × 7 = 567 81 × 9 = 729 81 × 6 = 486 81 × 10 = 810 81 × 11 = 891 81 × 5 = 405 81 × 12 = 972 81 × 4 = 324 80 × 8 = 640 82 × 8 = 656 83 × 8 = 664 79 × 8 = 632 84 × 8 = 672 78 × 8 = 624 85 × 8 = 680 77 × 8 = 616 8 × 81 = 648 9 × 72 = 648 12 × 54 = 648 18 × 36 = 648 24 × 27 = 648 27 × 24 = 648 74 × 19 = 1406 10 × 88 = 880 30 × 6 = 180 88 × 57 = 5016 87 × 82 = 7134 98 × 57 = 5586 32 × 45 = 1440 21 × 77 = 1617